<?php
if (! class_exists('PEAR')) {
    /**
     * PEAR, the PHP Extension and Application Repository
     *
     * PEAR class and PEAR_Error class
     *
     * PHP versions 4 and 5
     *
     * LICENSE: This source file is subject to version 3.0 of the PHP license
     * that is available through the world-wide-web at the following URI:
     * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
     * the PHP License and are unable to obtain it through the web, please
     * send a note to license@php.net so we can mail you a copy immediately.
     *
     * @category   pear
     * @package    PEAR
     * @author     Sterling Hughes <sterling@php.net>
     * @author     Stig Bakken <ssb@php.net>
     * @author     Tomas V.V.Cox <cox@idecnet.com>
     * @author     Greg Beaver <cellog@php.net>
     * @copyright  1997-2006 The PHP Group
     * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
     * @version    CVS: $Id: PEAR.php,v 1.101 2006/04/25 02:41:03 cellog Exp $
     * @link       http://pear.php.net/package/PEAR
     * @since      File available since Release 0.1
     */
    /**#@+
     * ERROR constants
     */
    define('PEAR_ERROR_RETURN', 1);
    define('PEAR_ERROR_PRINT', 2);
    define('PEAR_ERROR_TRIGGER', 4);
    define('PEAR_ERROR_DIE', 8);
    define('PEAR_ERROR_CALLBACK', 16);
    /**
     * WARNING: obsolete
     * @deprecated
     */
    define('PEAR_ERROR_EXCEPTION', 32);
    /**#@-*/
    define('PEAR_ZE2', (function_exists('version_compare') && version_compare(zend_version(), "2-dev", "ge")));
    if (substr(PHP_OS, 0, 3) == 'WIN') {
        define('OS_WINDOWS', true);
        define('OS_UNIX', false);
        define('PEAR_OS', 'Windows');
    } else {
        define('OS_WINDOWS', false);
        define('OS_UNIX', true);
        define('PEAR_OS', 'Unix'); // blatant assumption
    }
    // instant backwards compatibility
    if (! defined('PATH_SEPARATOR')) {
        if (OS_WINDOWS) {
            define('PATH_SEPARATOR', ';');
        } else {
            define('PATH_SEPARATOR', ':');
        }
    }
    $GLOBALS['_PEAR_default_error_mode'] = PEAR_ERROR_RETURN;
    $GLOBALS['_PEAR_default_error_options'] = E_USER_NOTICE;
    $GLOBALS['_PEAR_destructor_object_list'] = array();
    $GLOBALS['_PEAR_shutdown_funcs'] = array();
    $GLOBALS['_PEAR_error_handler_stack'] = array();
    @ini_set('track_errors', true);
    /**
     * Base class for other PEAR classes.  Provides rudimentary
     * emulation of destructors.
     *
     * If you want a destructor in your class, inherit PEAR and make a
     * destructor method called _yourclassname (same name as the
     * constructor, but with a "_" prefix).  Also, in your constructor you
     * have to call the PEAR constructor: $this->PEAR();.
     * The destructor method will be called without parameters.  Note that
     * at in some SAPI implementations (such as Apache), any output during
     * the request shutdown (in which destructors are called) seems to be
     * discarded.  If you need to get any debug information from your
     * destructor, use error_log(), syslog() or something similar.
     *
     * IMPORTANT! To use the emulated destructors you need to create the
     * objects by reference: $obj =& new PEAR_child;
     *
     * @category   pear
     * @package    PEAR
     * @author     Stig Bakken <ssb@php.net>
     * @author     Tomas V.V. Cox <cox@idecnet.com>
     * @author     Greg Beaver <cellog@php.net>
     * @copyright  1997-2006 The PHP Group
     * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
     * @version    Release: 1.5.4
     * @link       http://pear.php.net/package/PEAR
     * @see        PEAR_Error
     * @since      Class available since PHP 4.0.2
     * @link        http://pear.php.net/manual/en/core.pear.php#core.pear.pear
     */
    class PEAR
    {
        // {{{ properties
        /**
         * Whether to enable internal debug messages.
         *
         * @var     bool
         * @access  private
         */
        var $_debug = false;
        /**
         * Default error mode for this object.
         *
         * @var     int
         * @access  private
         */
        var $_default_error_mode = null;
        /**
         * Default error options used for this object when error mode
         * is PEAR_ERROR_TRIGGER.
         *
         * @var     int
         * @access  private
         */
        var $_default_error_options = null;
        /**
         * Default error handler (callback) for this object, if error mode is
         * PEAR_ERROR_CALLBACK.
         *
         * @var     string
         * @access  private
         */
        var $_default_error_handler = '';
        /**
         * Which class to use for error objects.
         *
         * @var     string
         * @access  private
         */
        var $_error_class = 'PEAR_Error';
        /**
         * An array of expected errors.
         *
         * @var     array
         * @access  private
         */
        var $_expected_errors = array();
        // }}}
        // {{{ constructor
        /**
         * Constructor.  Registers this object in
         * $_PEAR_destructor_object_list for destructor emulation if a
         * destructor object exists.
         *
         * @param string $error_class  (optional) which class to use for
         *        error objects, defaults to PEAR_Error.
         * @access public
         * @return void
         */
        function PEAR ($error_class = null)
        {
            $classname = strtolower(get_class($this));
            if ($this->_debug) {
                print "PEAR constructor called, class=$classname\n";
            }
            if ($error_class !== null) {
                $this->_error_class = $error_class;
            }
            while ($classname && strcasecmp($classname, "pear")) {
                $destructor = "_$classname";
                if (method_exists($this, $destructor)) {
                    global $_PEAR_destructor_object_list;
                    $_PEAR_destructor_object_list[] = &$this;
                    if (! isset($GLOBALS['_PEAR_SHUTDOWN_REGISTERED'])) {
                        register_shutdown_function("_PEAR_call_destructors");
                        $GLOBALS['_PEAR_SHUTDOWN_REGISTERED'] = true;
                    }
                    break;
                } else {
                    $classname = get_parent_class($classname);
                }
            }
        }
        // }}}
        // {{{ destructor
        /**
         * Destructor (the emulated type of...).  Does nothing right now,
         * but is included for forward compatibility, so subclass
         * destructors should always call it.
         *
         * See the note in the class desciption about output from
         * destructors.
         *
         * @access public
         * @return void
         */
        function _PEAR ()
        {
            if ($this->_debug) {
                printf("PEAR destructor called, class=%s\n", strtolower(get_class($this)));
            }
        }
        // }}}
        // {{{ getStaticProperty()
        /**
         * If you have a class that's mostly/entirely static, and you need static
         * properties, you can use this method to simulate them. Eg. in your method(s)
         * do this: $myVar = &PEAR::getStaticProperty('myclass', 'myVar');
         * You MUST use a reference, or they will not persist!
         *
         * @access public
         * @param  string $class  The calling classname, to prevent clashes
         * @param  string $var    The variable to retrieve.
         * @return mixed   A reference to the variable. If not set it will be
         *                 auto initialised to NULL.
         */
        function &getStaticProperty ($class, $var)
        {
            static $properties;
            if (! isset($properties[$class])) {
                $properties[$class] = array();
            }
            if (! array_key_exists($var, $properties[$class])) {
                $properties[$class][$var] = null;
            }
            return $properties[$class][$var];
        }
        // }}}
        // {{{ registerShutdownFunc()
        /**
         * Use this function to register a shutdown method for static
         * classes.
         *
         * @access public
         * @param  mixed $func  The function name (or array of class/method) to call
         * @param  mixed $args  The arguments to pass to the function
         * @return void
         */
        function registerShutdownFunc ($func, $args = array())
        {
            // if we are called statically, there is a potential
            // that no shutdown func is registered.  Bug #6445
            if (! isset($GLOBALS['_PEAR_SHUTDOWN_REGISTERED'])) {
                register_shutdown_function("_PEAR_call_destructors");
                $GLOBALS['_PEAR_SHUTDOWN_REGISTERED'] = true;
            }
            $GLOBALS['_PEAR_shutdown_funcs'][] = array($func , $args);
        }
        // }}}
        // {{{ isError()
        /**
         * Tell whether a value is a PEAR error.
         *
         * @param   mixed $data   the value to test
         * @param   int   $code   if $data is an error object, return true
         *                        only if $code is a string and
         *                        $obj->getMessage() == $code or
         *                        $code is an integer and $obj->getCode() == $code
         * @access  public
         * @return  bool    true if parameter is an error
         */
        function isError ($data, $code = null)
        {
            if (is_a($data, 'PEAR_Error')) {
                if (is_null($code)) {
                    return true;
                } elseif (is_string($code)) {
                    return $data->getMessage() == $code;
                } else {
                    return $data->getCode() == $code;
                }
            }
            return false;
        }
        // }}}
        // {{{ setErrorHandling()
        /**
         * Sets how errors generated by this object should be handled.
         * Can be invoked both in objects and statically.  If called
         * statically, setErrorHandling sets the default behaviour for all
         * PEAR objects.  If called in an object, setErrorHandling sets
         * the default behaviour for that object.
         *
         * @param int $mode
         *        One of PEAR_ERROR_RETURN, PEAR_ERROR_PRINT,
         *        PEAR_ERROR_TRIGGER, PEAR_ERROR_DIE,
         *        PEAR_ERROR_CALLBACK or PEAR_ERROR_EXCEPTION.
         *
         * @param mixed $options
         *        When $mode is PEAR_ERROR_TRIGGER, this is the error level (one
         *        of E_USER_NOTICE, E_USER_WARNING or E_USER_ERROR).
         *
         *        When $mode is PEAR_ERROR_CALLBACK, this parameter is expected
         *        to be the callback function or method.  A callback
         *        function is a string with the name of the function, a
         *        callback method is an array of two elements: the element
         *        at index 0 is the object, and the element at index 1 is
         *        the name of the method to call in the object.
         *
         *        When $mode is PEAR_ERROR_PRINT or PEAR_ERROR_DIE, this is
         *        a printf format string used when printing the error
         *        message.
         *
         * @access public
         * @return void
         * @see PEAR_ERROR_RETURN
         * @see PEAR_ERROR_PRINT
         * @see PEAR_ERROR_TRIGGER
         * @see PEAR_ERROR_DIE
         * @see PEAR_ERROR_CALLBACK
         * @see PEAR_ERROR_EXCEPTION
         *
         * @since PHP 4.0.5
         */
        function setErrorHandling ($mode = null, $options = null)
        {
            if (isset($this) && is_a($this, 'PEAR')) {
                $setmode = &$this->_default_error_mode;
                $setoptions = &$this->_default_error_options;
            } else {
                $setmode = &$GLOBALS['_PEAR_default_error_mode'];
                $setoptions = &$GLOBALS['_PEAR_default_error_options'];
            }
            switch ($mode) {
                case PEAR_ERROR_EXCEPTION:
                case PEAR_ERROR_RETURN:
                case PEAR_ERROR_PRINT:
                case PEAR_ERROR_TRIGGER:
                case PEAR_ERROR_DIE:
                case null:
                    $setmode = $mode;
                    $setoptions = $options;
                    break;
                case PEAR_ERROR_CALLBACK:
                    $setmode = $mode;
                    // class/object method callback
                    if (is_callable($options)) {
                        $setoptions = $options;
                    } else {
                        trigger_error("invalid error callback", E_USER_WARNING);
                    }
                    break;
                default:
                    trigger_error("invalid error mode", E_USER_WARNING);
                    break;
            }
        }
        // }}}
        // {{{ expectError()
        /**
         * This method is used to tell which errors you expect to get.
         * Expected errors are always returned with error mode
         * PEAR_ERROR_RETURN.  Expected error codes are stored in a stack,
         * and this method pushes a new element onto it.  The list of
         * expected errors are in effect until they are popped off the
         * stack with the popExpect() method.
         *
         * Note that this method can not be called statically
         *
         * @param mixed $code a single error code or an array of error codes to expect
         *
         * @return int     the new depth of the "expected errors" stack
         * @access public
         */
        function expectError ($code = '*')
        {
            if (is_array($code)) {
                array_push($this->_expected_errors, $code);
            } else {
                array_push($this->_expected_errors, array($code));
            }
            return sizeof($this->_expected_errors);
        }
        // }}}
        // {{{ popExpect()
        /**
         * This method pops one element off the expected error codes
         * stack.
         *
         * @return array   the list of error codes that were popped
         */
        function popExpect ()
        {
            return array_pop($this->_expected_errors);
        }
        // }}}
        // {{{ _checkDelExpect()
        /**
         * This method checks unsets an error code if available
         *
         * @param mixed error code
         * @return bool true if the error code was unset, false otherwise
         * @access private
         * @since PHP 4.3.0
         */
        function _checkDelExpect ($error_code)
        {
            $deleted = false;
            foreach ($this->_expected_errors as $key => $error_array) {
                if (in_array($error_code, $error_array)) {
                    unset($this->_expected_errors[$key][array_search($error_code, $error_array)]);
                    $deleted = true;
                }
                // clean up empty arrays
                if (0 == count($this->_expected_errors[$key])) {
                    unset($this->_expected_errors[$key]);
                }
            }
            return $deleted;
        }
        // }}}
        // {{{ delExpect()
        /**
         * This method deletes all occurences of the specified element from
         * the expected error codes stack.
         *
         * @param  mixed $error_code error code that should be deleted
         * @return mixed list of error codes that were deleted or error
         * @access public
         * @since PHP 4.3.0
         */
        function delExpect ($error_code)
        {
            $deleted = false;
            if ((is_array($error_code) && (0 != count($error_code)))) {
                // $error_code is a non-empty array here;
                // we walk through it trying to unset all
                // values
                foreach ($error_code as $key => $error) {
                    if ($this->_checkDelExpect($error)) {
                        $deleted = true;
                    } else {
                        $deleted = false;
                    }
                }
                return $deleted ? true : PEAR::raiseError("The expected error you submitted does not exist"); // IMPROVE ME
            } elseif (! empty($error_code)) {
                // $error_code comes alone, trying to unset it
                if ($this->_checkDelExpect($error_code)) {
                    return true;
                } else {
                    return PEAR::raiseError("The expected error you submitted does not exist"); // IMPROVE ME
                }
            } else {
                // $error_code is empty
                return PEAR::raiseError("The expected error you submitted is empty"); // IMPROVE ME
            }
        }
        // }}}
        // {{{ raiseError()
        /**
         * This method is a wrapper that returns an instance of the
         * configured error class with this object's default error
         * handling applied.  If the $mode and $options parameters are not
         * specified, the object's defaults are used.
         *
         * @param mixed $message a text error message or a PEAR error object
         *
         * @param int $code      a numeric error code (it is up to your class
         *                  to define these if you want to use codes)
         *
         * @param int $mode      One of PEAR_ERROR_RETURN, PEAR_ERROR_PRINT,
         *                  PEAR_ERROR_TRIGGER, PEAR_ERROR_DIE,
         *                  PEAR_ERROR_CALLBACK, PEAR_ERROR_EXCEPTION.
         *
         * @param mixed $options If $mode is PEAR_ERROR_TRIGGER, this parameter
         *                  specifies the PHP-internal error level (one of
         *                  E_USER_NOTICE, E_USER_WARNING or E_USER_ERROR).
         *                  If $mode is PEAR_ERROR_CALLBACK, this
         *                  parameter specifies the callback function or
         *                  method.  In other error modes this parameter
         *                  is ignored.
         *
         * @param string $userinfo If you need to pass along for example debug
         *                  information, this parameter is meant for that.
         *
         * @param string $error_class The returned error object will be
         *                  instantiated from this class, if specified.
         *
         * @param bool $skipmsg If true, raiseError will only pass error codes,
         *                  the error message parameter will be dropped.
         *
         * @access public
         * @return object   a PEAR error object
         * @see PEAR::setErrorHandling
         * @since PHP 4.0.5
         */
        function &raiseError ($message = null, $code = null, $mode = null, $options = null, $userinfo = null, $error_class = null, $skipmsg = false)
        {
            // The error is yet a PEAR error object
            if (is_object($message)) {
                $code = $message->getCode();
                $userinfo = $message->getUserInfo();
                $error_class = $message->getType();
                $message->error_message_prefix = '';
                $message = $message->getMessage();
            }
            if (isset($this) && isset($this->_expected_errors) && sizeof($this->_expected_errors) > 0 && sizeof($exp = end($this->_expected_errors))) {
                if ($exp[0] == "*" || (is_int(reset($exp)) && in_array($code, $exp)) || (is_string(reset($exp)) && in_array($message, $exp))) {
                    $mode = PEAR_ERROR_RETURN;
                }
            }
            // No mode given, try global ones
            if ($mode === null) {
                // Class error handler
                if (isset($this) && isset($this->_default_error_mode)) {
                    $mode = $this->_default_error_mode;
                    $options = $this->_default_error_options;
                    // Global error handler
                } elseif (isset($GLOBALS['_PEAR_default_error_mode'])) {
                    $mode = $GLOBALS['_PEAR_default_error_mode'];
                    $options = $GLOBALS['_PEAR_default_error_options'];
                }
            }
            if ($error_class !== null) {
                $ec = $error_class;
            } elseif (isset($this) && isset($this->_error_class)) {
                $ec = $this->_error_class;
            } else {
                $ec = 'PEAR_Error';
            }
            if ($skipmsg) {
                $a = &new $ec($code, $mode, $options, $userinfo);
                return $a;
            } else {
                $a = &new $ec($message, $code, $mode, $options, $userinfo);
                return $a;
            }
        }
        // }}}
        // {{{ throwError()
        /**
         * Simpler form of raiseError with fewer options.  In most cases
         * message, code and userinfo are enough.
         *
         * @param string $message
         *
         */
        function &throwError ($message = null, $code = null, $userinfo = null)
        {
            if (isset($this) && is_a($this, 'PEAR')) {
                $a = &$this->raiseError($message, $code, null, null, $userinfo);
                return $a;
            } else {
                $a = &PEAR::raiseError($message, $code, null, null, $userinfo);
                return $a;
            }
        }
        // }}}
        function staticPushErrorHandling ($mode, $options = null)
        {
            $stack = &$GLOBALS['_PEAR_error_handler_stack'];
            $def_mode = &$GLOBALS['_PEAR_default_error_mode'];
            $def_options = &$GLOBALS['_PEAR_default_error_options'];
            $stack[] = array($def_mode , $def_options);
            switch ($mode) {
                case PEAR_ERROR_EXCEPTION:
                case PEAR_ERROR_RETURN:
                case PEAR_ERROR_PRINT:
                case PEAR_ERROR_TRIGGER:
                case PEAR_ERROR_DIE:
                case null:
                    $def_mode = $mode;
                    $def_options = $options;
                    break;
                case PEAR_ERROR_CALLBACK:
                    $def_mode = $mode;
                    // class/object method callback
                    if (is_callable($options)) {
                        $def_options = $options;
                    } else {
                        trigger_error("invalid error callback", E_USER_WARNING);
                    }
                    break;
                default:
                    trigger_error("invalid error mode", E_USER_WARNING);
                    break;
            }
            $stack[] = array($mode , $options);
            return true;
        }
        function staticPopErrorHandling ()
        {
            $stack = &$GLOBALS['_PEAR_error_handler_stack'];
            $setmode = &$GLOBALS['_PEAR_default_error_mode'];
            $setoptions = &$GLOBALS['_PEAR_default_error_options'];
            array_pop($stack);
            list ($mode, $options) = $stack[sizeof($stack) - 1];
            array_pop($stack);
            switch ($mode) {
                case PEAR_ERROR_EXCEPTION:
                case PEAR_ERROR_RETURN:
                case PEAR_ERROR_PRINT:
                case PEAR_ERROR_TRIGGER:
                case PEAR_ERROR_DIE:
                case null:
                    $setmode = $mode;
                    $setoptions = $options;
                    break;
                case PEAR_ERROR_CALLBACK:
                    $setmode = $mode;
                    // class/object method callback
                    if (is_callable($options)) {
                        $setoptions = $options;
                    } else {
                        trigger_error("invalid error callback", E_USER_WARNING);
                    }
                    break;
                default:
                    trigger_error("invalid error mode", E_USER_WARNING);
                    break;
            }
            return true;
        }
        // {{{ pushErrorHandling()
        /**
         * Push a new error handler on top of the error handler options stack. With this
         * you can easily override the actual error handler for some code and restore
         * it later with popErrorHandling.
         *
         * @param mixed $mode (same as setErrorHandling)
         * @param mixed $options (same as setErrorHandling)
         *
         * @return bool Always true
         *
         * @see PEAR::setErrorHandling
         */
        function pushErrorHandling ($mode, $options = null)
        {
            $stack = &$GLOBALS['_PEAR_error_handler_stack'];
            if (isset($this) && is_a($this, 'PEAR')) {
                $def_mode = &$this->_default_error_mode;
                $def_options = &$this->_default_error_options;
            } else {
                $def_mode = &$GLOBALS['_PEAR_default_error_mode'];
                $def_options = &$GLOBALS['_PEAR_default_error_options'];
            }
            $stack[] = array($def_mode , $def_options);
            if (isset($this) && is_a($this, 'PEAR')) {
                $this->setErrorHandling($mode, $options);
            } else {
                PEAR::setErrorHandling($mode, $options);
            }
            $stack[] = array($mode , $options);
            return true;
        }
        // }}}
        // {{{ popErrorHandling()
        /**
         * Pop the last error handler used
         *
         * @return bool Always true
         *
         * @see PEAR::pushErrorHandling
         */
        function popErrorHandling ()
        {
            $stack = &$GLOBALS['_PEAR_error_handler_stack'];
            array_pop($stack);
            list ($mode, $options) = $stack[sizeof($stack) - 1];
            array_pop($stack);
            if (isset($this) && is_a($this, 'PEAR')) {
                $this->setErrorHandling($mode, $options);
            } else {
                PEAR::setErrorHandling($mode, $options);
            }
            return true;
        }
        // }}}
        // {{{ loadExtension()
        /**
         * OS independant PHP extension load. Remember to take care
         * on the correct extension name for case sensitive OSes.
         *
         * @param string $ext The extension name
         * @return bool Success or not on the dl() call
         */
        function loadExtension ($ext)
        {
            if (! extension_loaded($ext)) {
                // if either returns true dl() will produce a FATAL error, stop that
                if ((ini_get('enable_dl') != 1) || (ini_get('safe_mode') == 1)) {
                    return false;
                }
                if (OS_WINDOWS) {
                    $suffix = '.dll';
                } elseif (PHP_OS == 'HP-UX') {
                    $suffix = '.sl';
                } elseif (PHP_OS == 'AIX') {
                    $suffix = '.a';
                } elseif (PHP_OS == 'OSX') {
                    $suffix = '.bundle';
                } else {
                    $suffix = '.so';
                }
                return @dl('php_' . $ext . $suffix) || @dl($ext . $suffix);
            }
            return true;
        }
        // }}}
    }
    // {{{ _PEAR_call_destructors()
    function _PEAR_call_destructors ()
    {
        global $_PEAR_destructor_object_list;
        if (is_array($_PEAR_destructor_object_list) && sizeof($_PEAR_destructor_object_list)) {
            reset($_PEAR_destructor_object_list);
            if (PEAR::getStaticProperty('PEAR', 'destructlifo')) {
                $_PEAR_destructor_object_list = array_reverse($_PEAR_destructor_object_list);
            }
            while (list ($k, $objref) = each($_PEAR_destructor_object_list)) {
                $classname = get_class($objref);
                while ($classname) {
                    $destructor = "_$classname";
                    if (method_exists($objref, $destructor)) {
                        $objref->$destructor();
                        break;
                    } else {
                        $classname = get_parent_class($classname);
                    }
                }
            }
            // Empty the object list to ensure that destructors are
            // not called more than once.
            $_PEAR_destructor_object_list = array();
        }
        // Now call the shutdown functions
        if (is_array($GLOBALS['_PEAR_shutdown_funcs']) and ! empty($GLOBALS['_PEAR_shutdown_funcs'])) {
            foreach ($GLOBALS['_PEAR_shutdown_funcs'] as $value) {
                call_user_func_array($value[0], $value[1]);
            }
        }
    }
    // }}}
    /**
     * Standard PEAR error class for PHP 4
     *
     * This class is supserseded by {@link PEAR_Exception} in PHP 5
     *
     * @category   pear
     * @package    PEAR
     * @author     Stig Bakken <ssb@php.net>
     * @author     Tomas V.V. Cox <cox@idecnet.com>
     * @author     Gregory Beaver <cellog@php.net>
     * @copyright  1997-2006 The PHP Group
     * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
     * @version    Release: 1.5.4
     * @link       http://pear.php.net/manual/en/core.pear.pear-error.php
     * @see        PEAR::raiseError(), PEAR::throwError()
     * @since      Class available since PHP 4.0.2
     */
    class PEAR_Error
    {
        // {{{ properties
        var $error_message_prefix = '';
        var $mode = PEAR_ERROR_RETURN;
        var $level = E_USER_NOTICE;
        var $code = - 1;
        var $message = '';
        var $userinfo = '';
        var $backtrace = null;
        // }}}
        // {{{ constructor
        /**
         * PEAR_Error constructor
         *
         * @param string $message  message
         *
         * @param int $code     (optional) error code
         *
         * @param int $mode     (optional) error mode, one of: PEAR_ERROR_RETURN,
         * PEAR_ERROR_PRINT, PEAR_ERROR_DIE, PEAR_ERROR_TRIGGER,
         * PEAR_ERROR_CALLBACK or PEAR_ERROR_EXCEPTION
         *
         * @param mixed $options   (optional) error level, _OR_ in the case of
         * PEAR_ERROR_CALLBACK, the callback function or object/method
         * tuple.
         *
         * @param string $userinfo (optional) additional user/debug info
         *
         * @access public
         *
         */
        function PEAR_Error ($message = 'unknown error', $code = null, $mode = null, $options = null, $userinfo = null)
        {
            if ($mode === null) {
                $mode = PEAR_ERROR_RETURN;
            }
            $this->message = $message;
            $this->code = $code;
            $this->mode = $mode;
            $this->userinfo = $userinfo;
            if (! PEAR::getStaticProperty('PEAR_Error', 'skiptrace')) {
                $this->backtrace = debug_backtrace();
                if (isset($this->backtrace[0]) && isset($this->backtrace[0]['object'])) {
                    unset($this->backtrace[0]['object']);
                }
            }
            if ($mode & PEAR_ERROR_CALLBACK) {
                $this->level = E_USER_NOTICE;
                $this->callback = $options;
            } else {
                if ($options === null) {
                    $options = E_USER_NOTICE;
                }
                $this->level = $options;
                $this->callback = null;
            }
            if ($this->mode & PEAR_ERROR_PRINT) {
                if (is_null($options) || is_int($options)) {
                    $format = "%s";
                } else {
                    $format = $options;
                }
                printf($format, $this->getMessage());
            }
            if ($this->mode & PEAR_ERROR_TRIGGER) {
                trigger_error($this->getMessage(), $this->level);
            }
            if ($this->mode & PEAR_ERROR_DIE) {
                $msg = $this->getMessage();
                if (is_null($options) || is_int($options)) {
                    $format = "%s";
                    if (substr($msg, - 1) != "\n") {
                        $msg .= "\n";
                    }
                } else {
                    $format = $options;
                }
                die(sprintf($format, $msg));
            }
            if ($this->mode & PEAR_ERROR_CALLBACK) {
                if (is_callable($this->callback)) {
                    call_user_func($this->callback, $this);
                }
            }
            if ($this->mode & PEAR_ERROR_EXCEPTION) {
                trigger_error("PEAR_ERROR_EXCEPTION is obsolete, use class PEAR_Exception for exceptions", E_USER_WARNING);
                eval('$e = new Exception($this->message, $this->code);throw($e);');
            }
        }
        // }}}
        // {{{ getMode()
        /**
         * Get the error mode from an error object.
         *
         * @return int error mode
         * @access public
         */
        function getMode ()
        {
            return $this->mode;
        }
        // }}}
        // {{{ getCallback()
        /**
         * Get the callback function/method from an error object.
         *
         * @return mixed callback function or object/method array
         * @access public
         */
        function getCallback ()
        {
            return $this->callback;
        }
        // }}}
        // {{{ getMessage()
        /**
         * Get the error message from an error object.
         *
         * @return  string  full error message
         * @access public
         */
        function getMessage ()
        {
            return ($this->error_message_prefix . $this->message);
        }
        // }}}
        // {{{ getCode()
        /**
         * Get error code from an error object
         *
         * @return int error code
         * @access public
         */
        function getCode ()
        {
            return $this->code;
        }
        // }}}
        // {{{ getType()
        /**
         * Get the name of this error/exception.
         *
         * @return string error/exception name (type)
         * @access public
         */
        function getType ()
        {
            return get_class($this);
        }
        // }}}
        // {{{ getUserInfo()
        /**
         * Get additional user-supplied information.
         *
         * @return string user-supplied information
         * @access public
         */
        function getUserInfo ()
        {
            return $this->userinfo;
        }
        // }}}
        // {{{ getDebugInfo()
        /**
         * Get additional debug information supplied by the application.
         *
         * @return string debug information
         * @access public
         */
        function getDebugInfo ()
        {
            return $this->getUserInfo();
        }
        // }}}
        // {{{ getBacktrace()
        /**
         * Get the call backtrace from where the error was generated.
         * Supported with PHP 4.3.0 or newer.
         *
         * @param int $frame (optional) what frame to fetch
         * @return array Backtrace, or NULL if not available.
         * @access public
         */
        function getBacktrace ($frame = null)
        {
            if (defined('PEAR_IGNORE_BACKTRACE')) {
                return null;
            }
            if ($frame === null) {
                return $this->backtrace;
            }
            return $this->backtrace[$frame];
        }
        // }}}
        // {{{ addUserInfo()
        function addUserInfo ($info)
        {
            if (empty($this->userinfo)) {
                $this->userinfo = $info;
            } else {
                $this->userinfo .= " ** $info";
            }
        }
        // }}}
        // {{{ toString()
        /**
         * Make a string representation of this object.
         *
         * @return string a string with an object summary
         * @access public
         */
        function toString ()
        {
            $modes = array();
            $levels = array(E_USER_NOTICE => 'notice' , E_USER_WARNING => 'warning' , E_USER_ERROR => 'error');
            if ($this->mode & PEAR_ERROR_CALLBACK) {
                if (is_array($this->callback)) {
                    $callback = (is_object($this->callback[0]) ? strtolower(get_class($this->callback[0])) : $this->callback[0]) . '::' . $this->callback[1];
                } else {
                    $callback = $this->callback;
                }
                return sprintf('[%s: message="%s" code=%d mode=callback ' . 'callback=%s prefix="%s" info="%s"]', strtolower(get_class($this)), $this->message, $this->code, $callback, $this->error_message_prefix, $this->userinfo);
            }
            if ($this->mode & PEAR_ERROR_PRINT) {
                $modes[] = 'print';
            }
            if ($this->mode & PEAR_ERROR_TRIGGER) {
                $modes[] = 'trigger';
            }
            if ($this->mode & PEAR_ERROR_DIE) {
                $modes[] = 'die';
            }
            if ($this->mode & PEAR_ERROR_RETURN) {
                $modes[] = 'return';
            }
            return sprintf('[%s: message="%s" code=%d mode=%s level=%s ' . 'prefix="%s" info="%s"]', strtolower(get_class($this)), $this->message, $this->code, implode("|", $modes), $levels[$this->level], $this->error_message_prefix, $this->userinfo);
        }
        // }}}
    }
    /*
 * Local Variables:
 * mode: php
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */
} else {
    require_once 'PEAR.php';
}
?>
